Messages in this thread | | | Date | Thu, 12 Feb 2015 13:39:06 +0100 | From | Peter Zijlstra <> | Subject | Re: [RFC PATCH 6/9] livepatch: create per-task consistency model |
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On Thu, Feb 12, 2015 at 01:25:14PM +0100, Jiri Kosina wrote: > On Thu, 12 Feb 2015, Peter Zijlstra wrote: > > > Its not at all clear how all this would work to me. And I'm not > > motivated enough to go try and reverse engineer your patch; IMO > > livepatching is utter fail. > > > > If your infrastructure relies on the uptime of a single machine you've > > lost already. > > Well, the fact indisputable fact is that there is a demand for this. It's > not about one machine, it's about scheduling dowtimes of datacentres.
The changelog says:
> ... A patch can remain in the > transition state indefinitely, if any of the tasks are stuck in the > previous universe.
Therefore there is no scheduling anything. Without timeliness guarantees you can't make a schedule.
Might as well just reboot, at least that's fairly well guaranteed to happen.
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